This subclass covers methods or apparatus specific to mining or quarrying

This subclass does not cover, even though they may be disclosed only for mining or quarrying, drill bits, bore reamers, core taking devices, drilling pipes or rods, handling, racking or connecting arrangements for drilling pipes or rods, counterboring or enlarging drilled holes, flame drilling, or other drilling apparatus, which are covered by subclass E21B

WARNING

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The following IPC groups are not used in the CPC scheme. Subject matter covered by these groups is classified in the following CPC groups:

Slitting by unguided cutter cables or cutter chains, or by unguided tools drawn along the working face by cables or the like (dislodging by planing means E21C 27/32; propulsion by haulage cables E21C 29/14) [2013‑01]

E21C 25/56

.

Slitting by cutter cables or cutter chains or by tools drawn along the working face by cables or the like, in each case guided parallel to the face, e.g. by a conveyer, by a guide parallel to a conveyer (pressing the conveyer equipped with tools towards the working face E21C 35/14) [2013‑01]

E21C 25/58

.

Machines slitting by drilling hole on hole [2013‑01]

E21C 25/60

.

Slitting by jets of water or other liquid (picks with arrangements of fluid-spraying nozzles E21C 35/187; distribution of spraying fluids in rotating cutter-heads E21C 35/23) [2013‑01]

E21C 25/62

.

Machines for making slits approximately perpendicular to the seams either level with, or above or below the level of, the machine [2013‑01]

by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid (slitting by jets of water E21C 25/60; blasting by explosives F42D) [2013‑01]

E21C 37/14

. .

by compressed air; by gas blast; by gasifying liquids [2013‑01]

E21C 37/16

.

by fire-setting or by similar methods based on a heat effect (drilling by use of heat E21B 7/14) [2013‑01]